drivers/tty/amiserial.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Serial driver for the amiga builtin port.
   4  *
   5  * This code was created by taking serial.c version 4.30 from kernel
   6  * release 2.3.22, replacing all hardware related stuff with the
   7  * corresponding amiga hardware actions, and removing all irrelevant
   8  * code. As a consequence, it uses many of the constants and names
   9  * associated with the registers and bits of 16550 compatible UARTS -
  10  * but only to keep track of status, etc in the state variables. It
  11  * was done this was to make it easier to keep the code in line with
  12  * (non hardware specific) changes to serial.c.
  13  *
  14  * The port is registered with the tty driver as minor device 64, and
  15  * therefore other ports should should only use 65 upwards.
  16  *
  17  * Richard Lucock 28/12/99
  18  *
  19  *  Copyright (C) 1991, 1992  Linus Torvalds
  20  *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
  21  *              1998, 1999  Theodore Ts'o
  22  *
  23  */
  24
  25 /* Set of debugging defines */
  26
  27 #undef SERIAL_DEBUG_INTR
  28 #undef SERIAL_DEBUG_OPEN
  29 #undef SERIAL_DEBUG_FLOW
  30 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
  31
  32 /*
  33  * End of serial driver configuration section.
  34  */
  35
  36 #include <linux/bitops.h>
  37 #include <linux/circ_buf.h>
  38 #include <linux/console.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/fcntl.h>
  42 #include <linux/init.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/ioport.h>
  45 #include <linux/kernel.h>
  46 #include <linux/major.h>
  47 #include <linux/mm.h>
  48 #include <linux/module.h>
  49 #include <linux/platform_device.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/seq_file.h>
  52 #include <linux/serial.h>
  53 #include <linux/serial_reg.h>
  54 #include <linux/sched.h>
  55 #include <linux/signal.h>
  56 #include <linux/slab.h>
  57 #include <linux/string.h>
  58 #include <linux/timer.h>
  59 #include <linux/tty_flip.h>
  60 #include <linux/tty.h>
  61 #include <linux/types.h>
  62 #include <linux/uaccess.h>
  63
  64 #include <asm/amigahw.h>
  65 #include <asm/amigaints.h>
  66 #include <asm/irq.h>
  67 #include <asm/setup.h>
  68
  69 struct serial_state {
  70         struct tty_port         tport;
  71         struct circ_buf         xmit;
  72         struct async_icount     icount;
  73
  74         unsigned long           port;
  75         int                     baud_base;
  76         int                     custom_divisor;
  77         int                     read_status_mask;
  78         int                     ignore_status_mask;
  79         int                     timeout;
  80         int                     quot;
  81         int                     IER;    /* Interrupt Enable Register */
  82         int                     MCR;    /* Modem control register */
  83         int                     x_char; /* xon/xoff character */
  84 };
  85
  86 static struct tty_driver *serial_driver;
  87
  88 /* number of characters left in xmit buffer before we ask for more */
  89 #define WAKEUP_CHARS 256
  90
  91 #define XMIT_FIFO_SIZE 1
  92
  93 static unsigned char current_ctl_bits;
  94
  95 static void change_speed(struct tty_struct *tty, struct serial_state *info,
  96                 struct ktermios *old);
  97 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
  98
  99
 100 static struct serial_state serial_state;
 101
 102 /* some serial hardware definitions */
 103 #define SDR_OVRUN   (1<<15)
 104 #define SDR_RBF     (1<<14)
 105 #define SDR_TBE     (1<<13)
 106 #define SDR_TSRE    (1<<12)
 107
 108 #define SERPER_PARENB    (1<<15)
 109
 110 #define AC_SETCLR   (1<<15)
 111 #define AC_UARTBRK  (1<<11)
 112
 113 #define SER_DTR     (1<<7)
 114 #define SER_RTS     (1<<6)
 115 #define SER_DCD     (1<<5)
 116 #define SER_CTS     (1<<4)
 117 #define SER_DSR     (1<<3)
 118
 119 static __inline__ void rtsdtr_ctrl(int bits)
 120 {
 121     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
 122 }
 123
 124 /*
 125  * ------------------------------------------------------------
 126  * rs_stop() and rs_start()
 127  *
 128  * This routines are called before setting or resetting tty->flow.stopped.
 129  * They enable or disable transmitter interrupts, as necessary.
 130  * ------------------------------------------------------------
 131  */
 132 static void rs_stop(struct tty_struct *tty)
 133 {
 134         struct serial_state *info = tty->driver_data;
 135         unsigned long flags;
 136
 137         local_irq_save(flags);
 138         if (info->IER & UART_IER_THRI) {
 139                 info->IER &= ~UART_IER_THRI;
 140                 /* disable Tx interrupt and remove any pending interrupts */
 141                 amiga_custom.intena = IF_TBE;
 142                 mb();
 143                 amiga_custom.intreq = IF_TBE;
 144                 mb();
 145         }
 146         local_irq_restore(flags);
 147 }
 148
 149 static void rs_start(struct tty_struct *tty)
 150 {
 151         struct serial_state *info = tty->driver_data;
 152         unsigned long flags;
 153
 154         local_irq_save(flags);
 155         if (info->xmit.head != info->xmit.tail
 156             && info->xmit.buf
 157             && !(info->IER & UART_IER_THRI)) {
 158                 info->IER |= UART_IER_THRI;
 159                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 160                 mb();
 161                 /* set a pending Tx Interrupt, transmitter should restart now */
 162                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 163                 mb();
 164         }
 165         local_irq_restore(flags);
 166 }
 167
 168 /*
 169  * ----------------------------------------------------------------------
 170  *
 171  * Here start the interrupt handling routines.
 172  *
 173  * -----------------------------------------------------------------------
 174  */
 175
 176 static void receive_chars(struct serial_state *info)
 177 {
 178         int status;
 179         int serdatr;
 180         unsigned char ch, flag;
 181         struct  async_icount *icount;
 182         int oe = 0;
 183
 184         icount = &info->icount;
 185
 186         status = UART_LSR_DR; /* We obviously have a character! */
 187         serdatr = amiga_custom.serdatr;
 188         mb();
 189         amiga_custom.intreq = IF_RBF;
 190         mb();
 191
 192         if((serdatr & 0x1ff) == 0)
 193             status |= UART_LSR_BI;
 194         if(serdatr & SDR_OVRUN)
 195             status |= UART_LSR_OE;
 196
 197         ch = serdatr & 0xff;
 198         icount->rx++;
 199
 200 #ifdef SERIAL_DEBUG_INTR
 201         printk("DR%02x:%02x...", ch, status);
 202 #endif
 203         flag = TTY_NORMAL;
 204
 205         /*
 206          * We don't handle parity or frame errors - but I have left
 207          * the code in, since I'm not sure that the errors can't be
 208          * detected.
 209          */
 210
 211         if (status & (UART_LSR_BI | UART_LSR_PE |
 212                       UART_LSR_FE | UART_LSR_OE)) {
 213           /*
 214            * For statistics only
 215            */
 216           if (status & UART_LSR_BI) {
 217             status &= ~(UART_LSR_FE | UART_LSR_PE);
 218             icount->brk++;
 219           } else if (status & UART_LSR_PE)
 220             icount->parity++;
 221           else if (status & UART_LSR_FE)
 222             icount->frame++;
 223           if (status & UART_LSR_OE)
 224             icount->overrun++;
 225
 226           /*
 227            * Now check to see if character should be
 228            * ignored, and mask off conditions which
 229            * should be ignored.
 230            */
 231           if (status & info->ignore_status_mask)
 232             goto out;
 233
 234           status &= info->read_status_mask;
 235
 236           if (status & (UART_LSR_BI)) {
 237 #ifdef SERIAL_DEBUG_INTR
 238             printk("handling break....");
 239 #endif
 240             flag = TTY_BREAK;
 241             if (info->tport.flags & ASYNC_SAK)
 242               do_SAK(info->tport.tty);
 243           } else if (status & UART_LSR_PE)
 244             flag = TTY_PARITY;
 245           else if (status & UART_LSR_FE)
 246             flag = TTY_FRAME;
 247           if (status & UART_LSR_OE) {
 248             /*
 249              * Overrun is special, since it's
 250              * reported immediately, and doesn't
 251              * affect the current character
 252              */
 253              oe = 1;
 254           }
 255         }
 256         tty_insert_flip_char(&info->tport, ch, flag);
 257         if (oe == 1)
 258                 tty_insert_flip_char(&info->tport, 0, TTY_OVERRUN);
 259         tty_flip_buffer_push(&info->tport);
 260 out:
 261         return;
 262 }
 263
 264 static void transmit_chars(struct serial_state *info)
 265 {
 266         amiga_custom.intreq = IF_TBE;
 267         mb();
 268         if (info->x_char) {
 269                 amiga_custom.serdat = info->x_char | 0x100;
 270                 mb();
 271                 info->icount.tx++;
 272                 info->x_char = 0;
 273                 return;
 274         }
 275         if (info->xmit.head == info->xmit.tail
 276             || info->tport.tty->flow.stopped
 277             || info->tport.tty->hw_stopped) {
 278                 info->IER &= ~UART_IER_THRI;
 279                 amiga_custom.intena = IF_TBE;
 280                 mb();
 281                 return;
 282         }
 283
 284         amiga_custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
 285         mb();
 286         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
 287         info->icount.tx++;
 288
 289         if (CIRC_CNT(info->xmit.head,
 290                      info->xmit.tail,
 291                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
 292                 tty_wakeup(info->tport.tty);
 293
 294 #ifdef SERIAL_DEBUG_INTR
 295         printk("THRE...");
 296 #endif
 297         if (info->xmit.head == info->xmit.tail) {
 298                 amiga_custom.intena = IF_TBE;
 299                 mb();
 300                 info->IER &= ~UART_IER_THRI;
 301         }
 302 }
 303
 304 static void check_modem_status(struct serial_state *info)
 305 {
 306         struct tty_port *port = &info->tport;
 307         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 308         unsigned char dstatus;
 309         struct  async_icount *icount;
 310
 311         /* Determine bits that have changed */
 312         dstatus = status ^ current_ctl_bits;
 313         current_ctl_bits = status;
 314
 315         if (dstatus) {
 316                 icount = &info->icount;
 317                 /* update input line counters */
 318                 if (dstatus & SER_DSR)
 319                         icount->dsr++;
 320                 if (dstatus & SER_DCD) {
 321                         icount->dcd++;
 322                 }
 323                 if (dstatus & SER_CTS)
 324                         icount->cts++;
 325                 wake_up_interruptible(&port->delta_msr_wait);
 326         }
 327
 328         if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
 329 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
 330                 printk("ttyS%d CD now %s...", info->line,
 331                        (!(status & SER_DCD)) ? "on" : "off");
 332 #endif
 333                 if (!(status & SER_DCD))
 334                         wake_up_interruptible(&port->open_wait);
 335                 else {
 336 #ifdef SERIAL_DEBUG_OPEN
 337                         printk("doing serial hangup...");
 338 #endif
 339                         if (port->tty)
 340                                 tty_hangup(port->tty);
 341                 }
 342         }
 343         if (tty_port_cts_enabled(port)) {
 344                 if (port->tty->hw_stopped) {
 345                         if (!(status & SER_CTS)) {
 346 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 347                                 printk("CTS tx start...");
 348 #endif
 349                                 port->tty->hw_stopped = 0;
 350                                 info->IER |= UART_IER_THRI;
 351                                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 352                                 mb();
 353                                 /* set a pending Tx Interrupt, transmitter should restart now */
 354                                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 355                                 mb();
 356                                 tty_wakeup(port->tty);
 357                                 return;
 358                         }
 359                 } else {
 360                         if ((status & SER_CTS)) {
 361 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
 362                                 printk("CTS tx stop...");
 363 #endif
 364                                 port->tty->hw_stopped = 1;
 365                                 info->IER &= ~UART_IER_THRI;
 366                                 /* disable Tx interrupt and remove any pending interrupts */
 367                                 amiga_custom.intena = IF_TBE;
 368                                 mb();
 369                                 amiga_custom.intreq = IF_TBE;
 370                                 mb();
 371                         }
 372                 }
 373         }
 374 }
 375
 376 static irqreturn_t ser_vbl_int( int irq, void *data)
 377 {
 378         /* vbl is just a periodic interrupt we tie into to update modem status */
 379         struct serial_state *info = data;
 380         /*
 381          * TBD - is it better to unregister from this interrupt or to
 382          * ignore it if MSI is clear ?
 383          */
 384         if(info->IER & UART_IER_MSI)
 385           check_modem_status(info);
 386         return IRQ_HANDLED;
 387 }
 388
 389 static irqreturn_t ser_rx_int(int irq, void *dev_id)
 390 {
 391         struct serial_state *info = dev_id;
 392
 393 #ifdef SERIAL_DEBUG_INTR
 394         printk("ser_rx_int...");
 395 #endif
 396
 397         if (!info->tport.tty)
 398                 return IRQ_NONE;
 399
 400         receive_chars(info);
 401 #ifdef SERIAL_DEBUG_INTR
 402         printk("end.\n");
 403 #endif
 404         return IRQ_HANDLED;
 405 }
 406
 407 static irqreturn_t ser_tx_int(int irq, void *dev_id)
 408 {
 409         struct serial_state *info = dev_id;
 410
 411         if (amiga_custom.serdatr & SDR_TBE) {
 412 #ifdef SERIAL_DEBUG_INTR
 413           printk("ser_tx_int...");
 414 #endif
 415
 416           if (!info->tport.tty)
 417                 return IRQ_NONE;
 418
 419           transmit_chars(info);
 420 #ifdef SERIAL_DEBUG_INTR
 421           printk("end.\n");
 422 #endif
 423         }
 424         return IRQ_HANDLED;
 425 }
 426
 427 /*
 428  * -------------------------------------------------------------------
 429  * Here ends the serial interrupt routines.
 430  * -------------------------------------------------------------------
 431  */
 432
 433 /*
 434  * ---------------------------------------------------------------
 435  * Low level utility subroutines for the serial driver:  routines to
 436  * figure out the appropriate timeout for an interrupt chain, routines
 437  * to initialize and startup a serial port, and routines to shutdown a
 438  * serial port.  Useful stuff like that.
 439  * ---------------------------------------------------------------
 440  */
 441
 442 static int startup(struct tty_struct *tty, struct serial_state *info)
 443 {
 444         struct tty_port *port = &info->tport;
 445         unsigned long flags;
 446         int     retval=0;
 447         unsigned long page;
 448
 449         page = get_zeroed_page(GFP_KERNEL);
 450         if (!page)
 451                 return -ENOMEM;
 452
 453         local_irq_save(flags);
 454
 455         if (tty_port_initialized(port)) {
 456                 free_page(page);
 457                 goto errout;
 458         }
 459
 460         if (info->xmit.buf)
 461                 free_page(page);
 462         else
 463                 info->xmit.buf = (unsigned char *) page;
 464
 465 #ifdef SERIAL_DEBUG_OPEN
 466         printk("starting up ttys%d ...", info->line);
 467 #endif
 468
 469         /* Clear anything in the input buffer */
 470
 471         amiga_custom.intreq = IF_RBF;
 472         mb();
 473
 474         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
 475         if (retval) {
 476                 if (capable(CAP_SYS_ADMIN)) {
 477                         set_bit(TTY_IO_ERROR, &tty->flags);
 478                         retval = 0;
 479                 }
 480                 goto errout;
 481         }
 482
 483         /* enable both Rx and Tx interrupts */
 484         amiga_custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
 485         mb();
 486         info->IER = UART_IER_MSI;
 487
 488         /* remember current state of the DCD and CTS bits */
 489         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
 490
 491         info->MCR = 0;
 492         if (C_BAUD(tty))
 493           info->MCR = SER_DTR | SER_RTS;
 494         rtsdtr_ctrl(info->MCR);
 495
 496         clear_bit(TTY_IO_ERROR, &tty->flags);
 497         info->xmit.head = info->xmit.tail = 0;
 498
 499         /*
 500          * and set the speed of the serial port
 501          */
 502         change_speed(tty, info, NULL);
 503
 504         tty_port_set_initialized(port, 1);
 505         local_irq_restore(flags);
 506         return 0;
 507
 508 errout:
 509         local_irq_restore(flags);
 510         return retval;
 511 }
 512
 513 /*
 514  * This routine will shutdown a serial port; interrupts are disabled, and
 515  * DTR is dropped if the hangup on close termio flag is on.
 516  */
 517 static void shutdown(struct tty_struct *tty, struct serial_state *info)
 518 {
 519         unsigned long   flags;
 520
 521         if (!tty_port_initialized(&info->tport))
 522                 return;
 523
 524 #ifdef SERIAL_DEBUG_OPEN
 525         printk("Shutting down serial port %d ....\n", info->line);
 526 #endif
 527
 528         local_irq_save(flags); /* Disable interrupts */
 529
 530         /*
 531          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
 532          * here so the queue might never be waken up
 533          */
 534         wake_up_interruptible(&info->tport.delta_msr_wait);
 535
 536         /*
 537          * Free the IRQ, if necessary
 538          */
 539         free_irq(IRQ_AMIGA_VERTB, info);
 540
 541         if (info->xmit.buf) {
 542                 free_page((unsigned long) info->xmit.buf);
 543                 info->xmit.buf = NULL;
 544         }
 545
 546         info->IER = 0;
 547         amiga_custom.intena = IF_RBF | IF_TBE;
 548         mb();
 549
 550         /* disable break condition */
 551         amiga_custom.adkcon = AC_UARTBRK;
 552         mb();
 553
 554         if (C_HUPCL(tty))
 555                 info->MCR &= ~(SER_DTR|SER_RTS);
 556         rtsdtr_ctrl(info->MCR);
 557
 558         set_bit(TTY_IO_ERROR, &tty->flags);
 559
 560         tty_port_set_initialized(&info->tport, 0);
 561         local_irq_restore(flags);
 562 }
 563
 564
 565 /*
 566  * This routine is called to set the UART divisor registers to match
 567  * the specified baud rate for a serial port.
 568  */
 569 static void change_speed(struct tty_struct *tty, struct serial_state *info,
 570                          struct ktermios *old_termios)
 571 {
 572         struct tty_port *port = &info->tport;
 573         int     quot = 0, baud_base, baud;
 574         unsigned cflag, cval = 0;
 575         int     bits;
 576         unsigned long   flags;
 577
 578         cflag = tty->termios.c_cflag;
 579
 580         /* Byte size is always 8 bits plus parity bit if requested */
 581
 582         cval = 3; bits = 10;
 583         if (cflag & CSTOPB) {
 584                 cval |= 0x04;
 585                 bits++;
 586         }
 587         if (cflag & PARENB) {
 588                 cval |= UART_LCR_PARITY;
 589                 bits++;
 590         }
 591         if (!(cflag & PARODD))
 592                 cval |= UART_LCR_EPAR;
 593 #ifdef CMSPAR
 594         if (cflag & CMSPAR)
 595                 cval |= UART_LCR_SPAR;
 596 #endif
 597
 598         /* Determine divisor based on baud rate */
 599         baud = tty_get_baud_rate(tty);
 600         if (!baud)
 601                 baud = 9600;    /* B0 transition handled in rs_set_termios */
 602         baud_base = info->baud_base;
 603         if (baud == 38400 && (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 604                 quot = info->custom_divisor;
 605         else {
 606                 if (baud == 134)
 607                         /* Special case since 134 is really 134.5 */
 608                         quot = (2*baud_base / 269);
 609                 else if (baud)
 610                         quot = baud_base / baud;
 611         }
 612         /* If the quotient is zero refuse the change */
 613         if (!quot && old_termios) {
 614                 /* FIXME: Will need updating for new tty in the end */
 615                 tty->termios.c_cflag &= ~CBAUD;
 616                 tty->termios.c_cflag |= (old_termios->c_cflag & CBAUD);
 617                 baud = tty_get_baud_rate(tty);
 618                 if (!baud)
 619                         baud = 9600;
 620                 if (baud == 38400 &&
 621                     (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
 622                         quot = info->custom_divisor;
 623                 else {
 624                         if (baud == 134)
 625                                 /* Special case since 134 is really 134.5 */
 626                                 quot = (2*baud_base / 269);
 627                         else if (baud)
 628                                 quot = baud_base / baud;
 629                 }
 630         }
 631         /* As a last resort, if the quotient is zero, default to 9600 bps */
 632         if (!quot)
 633                 quot = baud_base / 9600;
 634         info->quot = quot;
 635         info->timeout = (XMIT_FIFO_SIZE*HZ*bits*quot) / baud_base;
 636         info->timeout += HZ/50;         /* Add .02 seconds of slop */
 637
 638         /* CTS flow control flag and modem status interrupts */
 639         info->IER &= ~UART_IER_MSI;
 640         if (port->flags & ASYNC_HARDPPS_CD)
 641                 info->IER |= UART_IER_MSI;
 642         tty_port_set_cts_flow(port, cflag & CRTSCTS);
 643         if (cflag & CRTSCTS)
 644                 info->IER |= UART_IER_MSI;
 645         tty_port_set_check_carrier(port, ~cflag & CLOCAL);
 646         if (~cflag & CLOCAL)
 647                 info->IER |= UART_IER_MSI;
 648         /* TBD:
 649          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
 650          */
 651
 652         /*
 653          * Set up parity check flag
 654          */
 655
 656         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
 657         if (I_INPCK(tty))
 658                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
 659         if (I_BRKINT(tty) || I_PARMRK(tty))
 660                 info->read_status_mask |= UART_LSR_BI;
 661
 662         /*
 663          * Characters to ignore
 664          */
 665         info->ignore_status_mask = 0;
 666         if (I_IGNPAR(tty))
 667                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
 668         if (I_IGNBRK(tty)) {
 669                 info->ignore_status_mask |= UART_LSR_BI;
 670                 /*
 671                  * If we're ignore parity and break indicators, ignore
 672                  * overruns too.  (For real raw support).
 673                  */
 674                 if (I_IGNPAR(tty))
 675                         info->ignore_status_mask |= UART_LSR_OE;
 676         }
 677         /*
 678          * !!! ignore all characters if CREAD is not set
 679          */
 680         if ((cflag & CREAD) == 0)
 681                 info->ignore_status_mask |= UART_LSR_DR;
 682         local_irq_save(flags);
 683
 684         {
 685           short serper;
 686
 687         /* Set up the baud rate */
 688           serper = quot - 1;
 689
 690         /* Enable or disable parity bit */
 691
 692         if(cval & UART_LCR_PARITY)
 693           serper |= (SERPER_PARENB);
 694
 695         amiga_custom.serper = serper;
 696         mb();
 697         }
 698
 699         local_irq_restore(flags);
 700 }
 701
 702 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
 703 {
 704         struct serial_state *info;
 705         unsigned long flags;
 706
 707         info = tty->driver_data;
 708
 709         if (!info->xmit.buf)
 710                 return 0;
 711
 712         local_irq_save(flags);
 713         if (CIRC_SPACE(info->xmit.head,
 714                        info->xmit.tail,
 715                        SERIAL_XMIT_SIZE) == 0) {
 716                 local_irq_restore(flags);
 717                 return 0;
 718         }
 719
 720         info->xmit.buf[info->xmit.head++] = ch;
 721         info->xmit.head &= SERIAL_XMIT_SIZE-1;
 722         local_irq_restore(flags);
 723         return 1;
 724 }
 725
 726 static void rs_flush_chars(struct tty_struct *tty)
 727 {
 728         struct serial_state *info = tty->driver_data;
 729         unsigned long flags;
 730
 731         if (info->xmit.head == info->xmit.tail
 732             || tty->flow.stopped
 733             || tty->hw_stopped
 734             || !info->xmit.buf)
 735                 return;
 736
 737         local_irq_save(flags);
 738         info->IER |= UART_IER_THRI;
 739         amiga_custom.intena = IF_SETCLR | IF_TBE;
 740         mb();
 741         /* set a pending Tx Interrupt, transmitter should restart now */
 742         amiga_custom.intreq = IF_SETCLR | IF_TBE;
 743         mb();
 744         local_irq_restore(flags);
 745 }
 746
 747 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
 748 {
 749         int     c, ret = 0;
 750         struct serial_state *info = tty->driver_data;
 751         unsigned long flags;
 752
 753         if (!info->xmit.buf)
 754                 return 0;
 755
 756         local_irq_save(flags);
 757         while (1) {
 758                 c = CIRC_SPACE_TO_END(info->xmit.head,
 759                                       info->xmit.tail,
 760                                       SERIAL_XMIT_SIZE);
 761                 if (count < c)
 762                         c = count;
 763                 if (c <= 0) {
 764                         break;
 765                 }
 766                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
 767                 info->xmit.head = ((info->xmit.head + c) &
 768                                    (SERIAL_XMIT_SIZE-1));
 769                 buf += c;
 770                 count -= c;
 771                 ret += c;
 772         }
 773         local_irq_restore(flags);
 774
 775         if (info->xmit.head != info->xmit.tail
 776             && !tty->flow.stopped
 777             && !tty->hw_stopped
 778             && !(info->IER & UART_IER_THRI)) {
 779                 info->IER |= UART_IER_THRI;
 780                 local_irq_disable();
 781                 amiga_custom.intena = IF_SETCLR | IF_TBE;
 782                 mb();
 783                 /* set a pending Tx Interrupt, transmitter should restart now */
 784                 amiga_custom.intreq = IF_SETCLR | IF_TBE;
 785                 mb();
 786                 local_irq_restore(flags);
 787         }
 788         return ret;
 789 }
 790
 791 static unsigned int rs_write_room(struct tty_struct *tty)
 792 {
 793         struct serial_state *info = tty->driver_data;
 794
 795         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 796 }
 797
 798 static unsigned int rs_chars_in_buffer(struct tty_struct *tty)
 799 {
 800         struct serial_state *info = tty->driver_data;
 801
 802         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 803 }
 804
 805 static void rs_flush_buffer(struct tty_struct *tty)
 806 {
 807         struct serial_state *info = tty->driver_data;
 808         unsigned long flags;
 809
 810         local_irq_save(flags);
 811         info->xmit.head = info->xmit.tail = 0;
 812         local_irq_restore(flags);
 813         tty_wakeup(tty);
 814 }
 815
 816 /*
 817  * This function is used to send a high-priority XON/XOFF character to
 818  * the device
 819  */
 820 static void rs_send_xchar(struct tty_struct *tty, char ch)
 821 {
 822         struct serial_state *info = tty->driver_data;
 823         unsigned long flags;
 824
 825         info->x_char = ch;
 826         if (ch) {
 827                 /* Make sure transmit interrupts are on */
 828
 829                 /* Check this ! */
 830                 local_irq_save(flags);
 831                 if(!(amiga_custom.intenar & IF_TBE)) {
 832                     amiga_custom.intena = IF_SETCLR | IF_TBE;
 833                     mb();
 834                     /* set a pending Tx Interrupt, transmitter should restart now */
 835                     amiga_custom.intreq = IF_SETCLR | IF_TBE;
 836                     mb();
 837                 }
 838                 local_irq_restore(flags);
 839
 840                 info->IER |= UART_IER_THRI;
 841         }
 842 }
 843
 844 /*
 845  * ------------------------------------------------------------
 846  * rs_throttle()
 847  *
 848  * This routine is called by the upper-layer tty layer to signal that
 849  * incoming characters should be throttled.
 850  * ------------------------------------------------------------
 851  */
 852 static void rs_throttle(struct tty_struct * tty)
 853 {
 854         struct serial_state *info = tty->driver_data;
 855         unsigned long flags;
 856 #ifdef SERIAL_DEBUG_THROTTLE
 857         printk("throttle %s ....\n", tty_name(tty));
 858 #endif
 859
 860         if (I_IXOFF(tty))
 861                 rs_send_xchar(tty, STOP_CHAR(tty));
 862
 863         if (C_CRTSCTS(tty))
 864                 info->MCR &= ~SER_RTS;
 865
 866         local_irq_save(flags);
 867         rtsdtr_ctrl(info->MCR);
 868         local_irq_restore(flags);
 869 }
 870
 871 static void rs_unthrottle(struct tty_struct * tty)
 872 {
 873         struct serial_state *info = tty->driver_data;
 874         unsigned long flags;
 875 #ifdef SERIAL_DEBUG_THROTTLE
 876         printk("unthrottle %s ....\n", tty_name(tty));
 877 #endif
 878
 879         if (I_IXOFF(tty)) {
 880                 if (info->x_char)
 881                         info->x_char = 0;
 882                 else
 883                         rs_send_xchar(tty, START_CHAR(tty));
 884         }
 885         if (C_CRTSCTS(tty))
 886                 info->MCR |= SER_RTS;
 887         local_irq_save(flags);
 888         rtsdtr_ctrl(info->MCR);
 889         local_irq_restore(flags);
 890 }
 891
 892 /*
 893  * ------------------------------------------------------------
 894  * rs_ioctl() and friends
 895  * ------------------------------------------------------------
 896  */
 897
 898 static int get_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 899 {
 900         struct serial_state *state = tty->driver_data;
 901         unsigned int close_delay, closing_wait;
 902
 903         tty_lock(tty);
 904         close_delay = jiffies_to_msecs(state->tport.close_delay) / 10;
 905         closing_wait = state->tport.closing_wait;
 906         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
 907                 closing_wait = jiffies_to_msecs(closing_wait) / 10;
 908
 909         ss->line = tty->index;
 910         ss->port = state->port;
 911         ss->flags = state->tport.flags;
 912         ss->xmit_fifo_size = XMIT_FIFO_SIZE;
 913         ss->baud_base = state->baud_base;
 914         ss->close_delay = close_delay;
 915         ss->closing_wait = closing_wait;
 916         ss->custom_divisor = state->custom_divisor;
 917         tty_unlock(tty);
 918         return 0;
 919 }
 920
 921 static int set_serial_info(struct tty_struct *tty, struct serial_struct *ss)
 922 {
 923         struct serial_state *state = tty->driver_data;
 924         struct tty_port *port = &state->tport;
 925         bool change_spd;
 926         int                     retval = 0;
 927         unsigned int close_delay, closing_wait;
 928
 929         tty_lock(tty);
 930         change_spd = ((ss->flags ^ port->flags) & ASYNC_SPD_MASK) ||
 931                 ss->custom_divisor != state->custom_divisor;
 932         if (ss->irq || ss->port != state->port ||
 933                         ss->xmit_fifo_size != XMIT_FIFO_SIZE) {
 934                 tty_unlock(tty);
 935                 return -EINVAL;
 936         }
 937
 938         close_delay = msecs_to_jiffies(ss->close_delay * 10);
 939         closing_wait = ss->closing_wait;
 940         if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
 941                 closing_wait = msecs_to_jiffies(closing_wait * 10);
 942
 943         if (!capable(CAP_SYS_ADMIN)) {
 944                 if ((ss->baud_base != state->baud_base) ||
 945                     (close_delay != port->close_delay) ||
 946                     (closing_wait != port->closing_wait) ||
 947                     ((ss->flags & ~ASYNC_USR_MASK) !=
 948                      (port->flags & ~ASYNC_USR_MASK))) {
 949                         tty_unlock(tty);
 950                         return -EPERM;
 951                 }
 952                 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
 953                                (ss->flags & ASYNC_USR_MASK));
 954                 state->custom_divisor = ss->custom_divisor;
 955                 goto check_and_exit;
 956         }
 957
 958         if (ss->baud_base < 9600) {
 959                 tty_unlock(tty);
 960                 return -EINVAL;
 961         }
 962
 963         /*
 964          * OK, past this point, all the error checking has been done.
 965          * At this point, we start making changes.....
 966          */
 967
 968         state->baud_base = ss->baud_base;
 969         port->flags = ((port->flags & ~ASYNC_FLAGS) |
 970                         (ss->flags & ASYNC_FLAGS));
 971         state->custom_divisor = ss->custom_divisor;
 972         port->close_delay = close_delay;
 973         port->closing_wait = closing_wait;
 974
 975 check_and_exit:
 976         if (tty_port_initialized(port)) {
 977                 if (change_spd) {
 978                         /* warn about deprecation unless clearing */
 979                         if (ss->flags & ASYNC_SPD_MASK)
 980                                 dev_warn_ratelimited(tty->dev, "use of SPD flags is deprecated\n");
 981                         change_speed(tty, state, NULL);
 982                 }
 983         } else
 984                 retval = startup(tty, state);
 985         tty_unlock(tty);
 986         return retval;
 987 }
 988
 989 /*
 990  * get_lsr_info - get line status register info
 991  *
 992  * Purpose: Let user call ioctl() to get info when the UART physically
 993  *          is emptied.  On bus types like RS485, the transmitter must
 994  *          release the bus after transmitting. This must be done when
 995  *          the transmit shift register is empty, not be done when the
 996  *          transmit holding register is empty.  This functionality
 997  *          allows an RS485 driver to be written in user space.
 998  */
 999 static int get_lsr_info(struct serial_state *info, unsigned int __user *value)
1000 {
1001         unsigned char status;
1002         unsigned int result;
1003         unsigned long flags;
1004
1005         local_irq_save(flags);
1006         status = amiga_custom.serdatr;
1007         mb();
1008         local_irq_restore(flags);
1009         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1010         if (copy_to_user(value, &result, sizeof(int)))
1011                 return -EFAULT;
1012         return 0;
1013 }
1014
1015
1016 static int rs_tiocmget(struct tty_struct *tty)
1017 {
1018         struct serial_state *info = tty->driver_data;
1019         unsigned char control, status;
1020         unsigned long flags;
1021
1022         if (tty_io_error(tty))
1023                 return -EIO;
1024
1025         control = info->MCR;
1026         local_irq_save(flags);
1027         status = ciab.pra;
1028         local_irq_restore(flags);
1029         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1030                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1031                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1032                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1033                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1034 }
1035
1036 static int rs_tiocmset(struct tty_struct *tty, unsigned int set,
1037                                                 unsigned int clear)
1038 {
1039         struct serial_state *info = tty->driver_data;
1040         unsigned long flags;
1041
1042         if (tty_io_error(tty))
1043                 return -EIO;
1044
1045         local_irq_save(flags);
1046         if (set & TIOCM_RTS)
1047                 info->MCR |= SER_RTS;
1048         if (set & TIOCM_DTR)
1049                 info->MCR |= SER_DTR;
1050         if (clear & TIOCM_RTS)
1051                 info->MCR &= ~SER_RTS;
1052         if (clear & TIOCM_DTR)
1053                 info->MCR &= ~SER_DTR;
1054         rtsdtr_ctrl(info->MCR);
1055         local_irq_restore(flags);
1056         return 0;
1057 }
1058
1059 /*
1060  * rs_break() --- routine which turns the break handling on or off
1061  */
1062 static int rs_break(struct tty_struct *tty, int break_state)
1063 {
1064         unsigned long flags;
1065
1066         local_irq_save(flags);
1067         if (break_state == -1)
1068           amiga_custom.adkcon = AC_SETCLR | AC_UARTBRK;
1069         else
1070           amiga_custom.adkcon = AC_UARTBRK;
1071         mb();
1072         local_irq_restore(flags);
1073         return 0;
1074 }
1075
1076 /*
1077  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1078  * Return: write counters to the user passed counter struct
1079  * NB: both 1->0 and 0->1 transitions are counted except for
1080  *     RI where only 0->1 is counted.
1081  */
1082 static int rs_get_icount(struct tty_struct *tty,
1083                                 struct serial_icounter_struct *icount)
1084 {
1085         struct serial_state *info = tty->driver_data;
1086         struct async_icount cnow;
1087         unsigned long flags;
1088
1089         local_irq_save(flags);
1090         cnow = info->icount;
1091         local_irq_restore(flags);
1092         icount->cts = cnow.cts;
1093         icount->dsr = cnow.dsr;
1094         icount->rng = cnow.rng;
1095         icount->dcd = cnow.dcd;
1096         icount->rx = cnow.rx;
1097         icount->tx = cnow.tx;
1098         icount->frame = cnow.frame;
1099         icount->overrun = cnow.overrun;
1100         icount->parity = cnow.parity;
1101         icount->brk = cnow.brk;
1102         icount->buf_overrun = cnow.buf_overrun;
1103
1104         return 0;
1105 }
1106
1107 static int rs_ioctl(struct tty_struct *tty,
1108                     unsigned int cmd, unsigned long arg)
1109 {
1110         struct serial_state *info = tty->driver_data;
1111         struct async_icount cprev, cnow;        /* kernel counter temps */
1112         void __user *argp = (void __user *)arg;
1113         unsigned long flags;
1114         DEFINE_WAIT(wait);
1115         int ret;
1116
1117         if ((cmd != TIOCSERCONFIG) &&
1118             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1119                 if (tty_io_error(tty))
1120                     return -EIO;
1121         }
1122
1123         switch (cmd) {
1124                 case TIOCSERCONFIG:
1125                         return 0;
1126
1127                 case TIOCSERGETLSR: /* Get line status register */
1128                         return get_lsr_info(info, argp);
1129
1130                 /*
1131                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1132                  * - mask passed in arg for lines of interest
1133                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1134                  * Caller should use TIOCGICOUNT to see which one it was
1135                  */
1136                 case TIOCMIWAIT:
1137                         local_irq_save(flags);
1138                         /* note the counters on entry */
1139                         cprev = info->icount;
1140                         local_irq_restore(flags);
1141                         while (1) {
1142                                 prepare_to_wait(&info->tport.delta_msr_wait,
1143                                                 &wait, TASK_INTERRUPTIBLE);
1144                                 local_irq_save(flags);
1145                                 cnow = info->icount; /* atomic copy */
1146                                 local_irq_restore(flags);
1147                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1148                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
1149                                         ret = -EIO; /* no change => error */
1150                                         break;
1151                                 }
1152                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1153                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1154                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1155                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1156                                         ret = 0;
1157                                         break;
1158                                 }
1159                                 schedule();
1160                                 /* see if a signal did it */
1161                                 if (signal_pending(current)) {
1162                                         ret = -ERESTARTSYS;
1163                                         break;
1164                                 }
1165                                 cprev = cnow;
1166                         }
1167                         finish_wait(&info->tport.delta_msr_wait, &wait);
1168                         return ret;
1169
1170                 default:
1171                         return -ENOIOCTLCMD;
1172                 }
1173         return 0;
1174 }
1175
1176 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1177 {
1178         struct serial_state *info = tty->driver_data;
1179         unsigned long flags;
1180         unsigned int cflag = tty->termios.c_cflag;
1181
1182         change_speed(tty, info, old_termios);
1183
1184         /* Handle transition to B0 status */
1185         if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) {
1186                 info->MCR &= ~(SER_DTR|SER_RTS);
1187                 local_irq_save(flags);
1188                 rtsdtr_ctrl(info->MCR);
1189                 local_irq_restore(flags);
1190         }
1191
1192         /* Handle transition away from B0 status */
1193         if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
1194                 info->MCR |= SER_DTR;
1195                 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
1196                         info->MCR |= SER_RTS;
1197                 local_irq_save(flags);
1198                 rtsdtr_ctrl(info->MCR);
1199                 local_irq_restore(flags);
1200         }
1201
1202         /* Handle turning off CRTSCTS */
1203         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1204                 tty->hw_stopped = 0;
1205                 rs_start(tty);
1206         }
1207
1208 #if 0
1209         /*
1210          * No need to wake up processes in open wait, since they
1211          * sample the CLOCAL flag once, and don't recheck it.
1212          * XXX  It's not clear whether the current behavior is correct
1213          * or not.  Hence, this may change.....
1214          */
1215         if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1216                 wake_up_interruptible(&info->open_wait);
1217 #endif
1218 }
1219
1220 /*
1221  * ------------------------------------------------------------
1222  * rs_close()
1223  *
1224  * This routine is called when the serial port gets closed.  First, we
1225  * wait for the last remaining data to be sent.  Then, we unlink its
1226  * async structure from the interrupt chain if necessary, and we free
1227  * that IRQ if nothing is left in the chain.
1228  * ------------------------------------------------------------
1229  */
1230 static void rs_close(struct tty_struct *tty, struct file * filp)
1231 {
1232         struct serial_state *state = tty->driver_data;
1233         struct tty_port *port = &state->tport;
1234
1235         if (tty_port_close_start(port, tty, filp) == 0)
1236                 return;
1237
1238         /*
1239          * At this point we stop accepting input.  To do this, we
1240          * disable the receive line status interrupts, and tell the
1241          * interrupt driver to stop checking the data ready bit in the
1242          * line status register.
1243          */
1244         state->read_status_mask &= ~UART_LSR_DR;
1245         if (tty_port_initialized(port)) {
1246                 /* disable receive interrupts */
1247                 amiga_custom.intena = IF_RBF;
1248                 mb();
1249                 /* clear any pending receive interrupt */
1250                 amiga_custom.intreq = IF_RBF;
1251                 mb();
1252
1253                 /*
1254                  * Before we drop DTR, make sure the UART transmitter
1255                  * has completely drained; this is especially
1256                  * important if there is a transmit FIFO!
1257                  */
1258                 rs_wait_until_sent(tty, state->timeout);
1259         }
1260         shutdown(tty, state);
1261         rs_flush_buffer(tty);
1262
1263         tty_ldisc_flush(tty);
1264         port->tty = NULL;
1265
1266         tty_port_close_end(port, tty);
1267 }
1268
1269 /*
1270  * rs_wait_until_sent() --- wait until the transmitter is empty
1271  */
1272 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1273 {
1274         struct serial_state *info = tty->driver_data;
1275         unsigned long orig_jiffies, char_time;
1276         int lsr;
1277
1278         orig_jiffies = jiffies;
1279
1280         /*
1281          * Set the check interval to be 1/5 of the estimated time to
1282          * send a single character, and make it at least 1.  The check
1283          * interval should also be less than the timeout.
1284          *
1285          * Note: we have to use pretty tight timings here to satisfy
1286          * the NIST-PCTS.
1287          */
1288         char_time = (info->timeout - HZ/50) / XMIT_FIFO_SIZE;
1289         char_time = char_time / 5;
1290         if (char_time == 0)
1291                 char_time = 1;
1292         if (timeout)
1293           char_time = min_t(unsigned long, char_time, timeout);
1294         /*
1295          * If the transmitter hasn't cleared in twice the approximate
1296          * amount of time to send the entire FIFO, it probably won't
1297          * ever clear.  This assumes the UART isn't doing flow
1298          * control, which is currently the case.  Hence, if it ever
1299          * takes longer than info->timeout, this is probably due to a
1300          * UART bug of some kind.  So, we clamp the timeout parameter at
1301          * 2*info->timeout.
1302          */
1303         if (!timeout || timeout > 2*info->timeout)
1304                 timeout = 2*info->timeout;
1305 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1306         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1307         printk("jiff=%lu...", jiffies);
1308 #endif
1309         while(!((lsr = amiga_custom.serdatr) & SDR_TSRE)) {
1310 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1311                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1312 #endif
1313                 msleep_interruptible(jiffies_to_msecs(char_time));
1314                 if (signal_pending(current))
1315                         break;
1316                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1317                         break;
1318         }
1319         __set_current_state(TASK_RUNNING);
1320
1321 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1322         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1323 #endif
1324 }
1325
1326 /*
1327  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1328  */
1329 static void rs_hangup(struct tty_struct *tty)
1330 {
1331         struct serial_state *info = tty->driver_data;
1332
1333         rs_flush_buffer(tty);
1334         shutdown(tty, info);
1335         info->tport.count = 0;
1336         tty_port_set_active(&info->tport, 0);
1337         info->tport.tty = NULL;
1338         wake_up_interruptible(&info->tport.open_wait);
1339 }
1340
1341 /*
1342  * This routine is called whenever a serial port is opened.  It
1343  * enables interrupts for a serial port, linking in its async structure into
1344  * the IRQ chain.   It also performs the serial-specific
1345  * initialization for the tty structure.
1346  */
1347 static int rs_open(struct tty_struct *tty, struct file * filp)
1348 {
1349         struct tty_port *port = tty->port;
1350         struct serial_state *info = container_of(port, struct serial_state,
1351                         tport);
1352         int retval;
1353
1354         port->count++;
1355         port->tty = tty;
1356         tty->driver_data = info;
1357
1358         retval = startup(tty, info);
1359         if (retval) {
1360                 return retval;
1361         }
1362
1363         return tty_port_block_til_ready(port, tty, filp);
1364 }
1365
1366 /*
1367  * /proc fs routines....
1368  */
1369
1370 static inline void line_info(struct seq_file *m, int line,
1371                 struct serial_state *state)
1372 {
1373         char    stat_buf[30], control, status;
1374         unsigned long flags;
1375
1376         seq_printf(m, "%d: uart:amiga_builtin", line);
1377
1378         local_irq_save(flags);
1379         status = ciab.pra;
1380         control = tty_port_initialized(&state->tport) ? state->MCR : status;
1381         local_irq_restore(flags);
1382
1383         stat_buf[0] = 0;
1384         stat_buf[1] = 0;
1385         if(!(control & SER_RTS))
1386                 strcat(stat_buf, "|RTS");
1387         if(!(status & SER_CTS))
1388                 strcat(stat_buf, "|CTS");
1389         if(!(control & SER_DTR))
1390                 strcat(stat_buf, "|DTR");
1391         if(!(status & SER_DSR))
1392                 strcat(stat_buf, "|DSR");
1393         if(!(status & SER_DCD))
1394                 strcat(stat_buf, "|CD");
1395
1396         if (state->quot)
1397                 seq_printf(m, " baud:%d", state->baud_base / state->quot);
1398
1399         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1400
1401         if (state->icount.frame)
1402                 seq_printf(m, " fe:%d", state->icount.frame);
1403
1404         if (state->icount.parity)
1405                 seq_printf(m, " pe:%d", state->icount.parity);
1406
1407         if (state->icount.brk)
1408                 seq_printf(m, " brk:%d", state->icount.brk);
1409
1410         if (state->icount.overrun)
1411                 seq_printf(m, " oe:%d", state->icount.overrun);
1412
1413         /*
1414          * Last thing is the RS-232 status lines
1415          */
1416         seq_printf(m, " %s\n", stat_buf+1);
1417 }
1418
1419 static int rs_proc_show(struct seq_file *m, void *v)
1420 {
1421         seq_printf(m, "serinfo:1.0 driver:4.30\n");
1422         line_info(m, 0, &serial_state);
1423         return 0;
1424 }
1425
1426 /*
1427  * ---------------------------------------------------------------------
1428  * rs_init() and friends
1429  *
1430  * rs_init() is called at boot-time to initialize the serial driver.
1431  * ---------------------------------------------------------------------
1432  */
1433
1434 static const struct tty_operations serial_ops = {
1435         .open = rs_open,
1436         .close = rs_close,
1437         .write = rs_write,
1438         .put_char = rs_put_char,
1439         .flush_chars = rs_flush_chars,
1440         .write_room = rs_write_room,
1441         .chars_in_buffer = rs_chars_in_buffer,
1442         .flush_buffer = rs_flush_buffer,
1443         .ioctl = rs_ioctl,
1444         .throttle = rs_throttle,
1445         .unthrottle = rs_unthrottle,
1446         .set_termios = rs_set_termios,
1447         .stop = rs_stop,
1448         .start = rs_start,
1449         .hangup = rs_hangup,
1450         .break_ctl = rs_break,
1451         .send_xchar = rs_send_xchar,
1452         .wait_until_sent = rs_wait_until_sent,
1453         .tiocmget = rs_tiocmget,
1454         .tiocmset = rs_tiocmset,
1455         .get_icount = rs_get_icount,
1456         .set_serial = set_serial_info,
1457         .get_serial = get_serial_info,
1458         .proc_show = rs_proc_show,
1459 };
1460
1461 static int amiga_carrier_raised(struct tty_port *port)
1462 {
1463         return !(ciab.pra & SER_DCD);
1464 }
1465
1466 static void amiga_dtr_rts(struct tty_port *port, int raise)
1467 {
1468         struct serial_state *info = container_of(port, struct serial_state,
1469                         tport);
1470         unsigned long flags;
1471
1472         if (raise)
1473                 info->MCR |= SER_DTR|SER_RTS;
1474         else
1475                 info->MCR &= ~(SER_DTR|SER_RTS);
1476
1477         local_irq_save(flags);
1478         rtsdtr_ctrl(info->MCR);
1479         local_irq_restore(flags);
1480 }
1481
1482 static const struct tty_port_operations amiga_port_ops = {
1483         .carrier_raised = amiga_carrier_raised,
1484         .dtr_rts = amiga_dtr_rts,
1485 };
1486
1487 /*
1488  * The serial driver boot-time initialization code!
1489  */
1490 static int __init amiga_serial_probe(struct platform_device *pdev)
1491 {
1492         struct serial_state *state = &serial_state;
1493         struct tty_driver *driver;
1494         unsigned long flags;
1495         int error;
1496
1497         driver = tty_alloc_driver(1, TTY_DRIVER_REAL_RAW);
1498         if (IS_ERR(driver))
1499                 return PTR_ERR(driver);
1500
1501         /* Initialize the tty_driver structure */
1502
1503         driver->driver_name = "amiserial";
1504         driver->name = "ttyS";
1505         driver->major = TTY_MAJOR;
1506         driver->minor_start = 64;
1507         driver->type = TTY_DRIVER_TYPE_SERIAL;
1508         driver->subtype = SERIAL_TYPE_NORMAL;
1509         driver->init_termios = tty_std_termios;
1510         driver->init_termios.c_cflag =
1511                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1512         tty_set_operations(driver, &serial_ops);
1513
1514         memset(state, 0, sizeof(*state));
1515         state->port = (int)&amiga_custom.serdatr; /* Just to give it a value */
1516         tty_port_init(&state->tport);
1517         state->tport.ops = &amiga_port_ops;
1518         tty_port_link_device(&state->tport, driver, 0);
1519
1520         error = tty_register_driver(driver);
1521         if (error)
1522                 goto fail_tty_driver_kref_put;
1523
1524         printk(KERN_INFO "ttyS0 is the amiga builtin serial port\n");
1525
1526         /* Hardware set up */
1527
1528         state->baud_base = amiga_colorclock;
1529
1530         /* set ISRs, and then disable the rx interrupts */
1531         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
1532         if (error)
1533                 goto fail_unregister;
1534
1535         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
1536                             "serial RX", state);
1537         if (error)
1538                 goto fail_free_irq;
1539
1540         local_irq_save(flags);
1541
1542         /* turn off Rx and Tx interrupts */
1543         amiga_custom.intena = IF_RBF | IF_TBE;
1544         mb();
1545
1546         /* clear any pending interrupt */
1547         amiga_custom.intreq = IF_RBF | IF_TBE;
1548         mb();
1549
1550         local_irq_restore(flags);
1551
1552         /*
1553          * set the appropriate directions for the modem control flags,
1554          * and clear RTS and DTR
1555          */
1556         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
1557         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
1558
1559         platform_set_drvdata(pdev, state);
1560
1561         serial_driver = driver;
1562
1563         return 0;
1564
1565 fail_free_irq:
1566         free_irq(IRQ_AMIGA_TBE, state);
1567 fail_unregister:
1568         tty_unregister_driver(driver);
1569 fail_tty_driver_kref_put:
1570         tty_port_destroy(&state->tport);
1571         tty_driver_kref_put(driver);
1572         return error;
1573 }
1574
1575 static int __exit amiga_serial_remove(struct platform_device *pdev)
1576 {
1577         struct serial_state *state = platform_get_drvdata(pdev);
1578
1579         tty_unregister_driver(serial_driver);
1580         tty_driver_kref_put(serial_driver);
1581         tty_port_destroy(&state->tport);
1582
1583         free_irq(IRQ_AMIGA_TBE, state);
1584         free_irq(IRQ_AMIGA_RBF, state);
1585
1586         return 0;
1587 }
1588
1589 static struct platform_driver amiga_serial_driver = {
1590         .remove = __exit_p(amiga_serial_remove),
1591         .driver   = {
1592                 .name   = "amiga-serial",
1593         },
1594 };
1595
1596 module_platform_driver_probe(amiga_serial_driver, amiga_serial_probe);
1597
1598
1599 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1600
1601 /*
1602  * ------------------------------------------------------------
1603  * Serial console driver
1604  * ------------------------------------------------------------
1605  */
1606
1607 static void amiga_serial_putc(char c)
1608 {
1609         amiga_custom.serdat = (unsigned char)c | 0x100;
1610         while (!(amiga_custom.serdatr & 0x2000))
1611                 barrier();
1612 }
1613
1614 /*
1615  *      Print a string to the serial port trying not to disturb
1616  *      any possible real use of the port...
1617  *
1618  *      The console must be locked when we get here.
1619  */
1620 static void serial_console_write(struct console *co, const char *s,
1621                                 unsigned count)
1622 {
1623         unsigned short intena = amiga_custom.intenar;
1624
1625         amiga_custom.intena = IF_TBE;
1626
1627         while (count--) {
1628                 if (*s == '\n')
1629                         amiga_serial_putc('\r');
1630                 amiga_serial_putc(*s++);
1631         }
1632
1633         amiga_custom.intena = IF_SETCLR | (intena & IF_TBE);
1634 }
1635
1636 static struct tty_driver *serial_console_device(struct console *c, int *index)
1637 {
1638         *index = 0;
1639         return serial_driver;
1640 }
1641
1642 static struct console sercons = {
1643         .name =         "ttyS",
1644         .write =        serial_console_write,
1645         .device =       serial_console_device,
1646         .flags =        CON_PRINTBUFFER,
1647         .index =        -1,
1648 };
1649
1650 /*
1651  *      Register console.
1652  */
1653 static int __init amiserial_console_init(void)
1654 {
1655         if (!MACH_IS_AMIGA)
1656                 return -ENODEV;
1657
1658         register_console(&sercons);
1659         return 0;
1660 }
1661 console_initcall(amiserial_console_init);
1662
1663 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1664
1665 MODULE_LICENSE("GPL");
1666 MODULE_ALIAS("platform:amiga-serial");